app.py

from gevent.monkey import patch_all
patch_all()

import random
import urlparse

import pystache
import twilio.twiml

from flask import Flask, request, render_template, url_for
from flask_cache import Cache
from flask_jsonpify import jsonify
from raven.contrib.flask import Sentry
from twilio import TwilioRestException

from models import db, aggregate_stats, log_call, call_count
from political_data import PoliticalData

app = Flask(__name__)

app.config.from_object('config.ConfigProduction')

cache = Cache(app, config={'CACHE_TYPE': 'simple'})
sentry = Sentry(app)

db.init_app(app)

call_methods = ['GET', 'POST']

data = PoliticalData()


def make_cache_key(*args, **kwargs):
    path = request.path
    args = str(hash(frozenset(request.args.items())))

    return (path + args).encode('utf-8')


def play_or_say(resp_or_gather, msg_template, **kwds):
    # take twilio response and play or say a mesage
    # can use mustache templates to render keword arguments
    msg = pystache.render(msg_template, kwds)

    if msg.startswith('http'):
        resp_or_gather.play(msg)
    elif msg:
        resp_or_gather.say(msg)


def full_url_for(route, **kwds):
    return urlparse.urljoin(app.config['APPLICATION_ROOT'],
                            url_for(route, **kwds))


def parse_params(r):
    params = {
        'userPhone': r.values.get('userPhone'),
        'campaignId': r.values.get('campaignId', 'default'),
        'zipcode': r.values.get('zipcode', None),
        'repIds': r.values.getlist('repIds')
    }

    # lookup campaign by ID
    campaign = data.get_campaign(params['campaignId'])

    # add repIds to the parameter set, if spec. by the campaign
    if campaign.get('repIds', None):
        if isinstance(campaign['repIds'], basestring):
            params['repIds'] = [campaign['repIds']]
        else:
            params['repIds'] = campaign['repIds']

    # get representative's id by zip code
    if params['zipcode'] and params['repIds']:
        params['repIds'] = data.locate_member_ids(
            params['zipcode'], campaign)

    if 'random_choice' in campaign:
        # pick a random choice among a selected set of members
        params['repIds'] = [random.choice(campaign['random_choice'])]

    return params, campaign


def intro_zip_gather(params, campaign):
    resp = twilio.twiml.Response()

    play_or_say(resp, campaign['msg_intro'])

    return zip_gather(resp, params, campaign)


def zip_gather(resp, params, campaign):
    with resp.gather(numDigits=5, method="POST",
                     action=url_for("zip_parse", **params)) as g:
        play_or_say(g, campaign['msg_ask_zip'])

    return str(resp)


def dialing_config(params):
    return {
        'timeLimit': app.config['TW_TIME_LIMIT'],
        'timeout': app.config['TW_TIMEOUT'],
        # allow the user to hangup and move onto next call
        'hangupOnStar': True,
        'action': url_for('call_complete', **params)
    }


def make_calls(params, campaign):
    """
    Connect a user to a sequence of congress members.
    Required params: campaignId, repIds
    Optional params: zipcode,
    """
    resp = twilio.twiml.Response()

    n_reps = len(params['repIds'])

    play_or_say(resp, campaign['msg_call_block_intro'],
                n_reps=n_reps, many_reps=n_reps > 1)

    resp.redirect(url_for('make_single_call', call_index=0, **params))

    return str(resp)


@app.route('/make_calls', methods=call_methods)
def _make_calls():
    params, campaign = parse_params(request)

    return make_calls(params, campaign)


@app.route('/create', methods=call_methods)
def call_user():
    """
    Makes a phone call to a user.
    Required Params:
        userPhone
        campaignId
    Optional Params:
        zipcode
        repIds
    """
    # parse the info needed to make the call
    params, campaign = parse_params(request)

    # initiate the call
    try:
        call = app.config['TW_CLIENT'].calls.create(
            to=params['userPhone'],
            from_=random.choice(campaign['numbers']),
            url=full_url_for("connection", **params),
            timeLimit=app.config['TW_TIME_LIMIT'],
            timeout=app.config['TW_TIMEOUT'],
            status_callback=full_url_for("call_complete_status", **params))

        result = jsonify(message=call.status, debugMode=app.debug)
        result.status_code = 200 if call.status != 'failed' else 500
    except TwilioRestException, err:
        result = jsonify(message=err.msg.split(':')[1].strip())
        result.status_code = 200

    return result


@app.route('/connection', methods=call_methods)
def connection():
    """
    Call handler to connect a user with their congress person(s).
    Required Params:
        campaignId
    Optional Params:
        zipcode
        repIds (if not present go to incoming_call flow and asked for zipcode)
    """
    params, campaign = parse_params(request)

    if params['repIds']:
        resp = twilio.twiml.Response()

        play_or_say(resp, campaign['msg_intro'])

        action = url_for("_make_calls", **params)

        with resp.gather(numDigits=1, method="POST", timeout=10,
                         action=action) as g:
            play_or_say(g, campaign['msg_intro_confirm'])

            return str(resp)
    else:
        return intro_zip_gather(params, campaign)


@app.route('/incoming_call', methods=call_methods)
def incoming_call():
    """
    Handles incoming calls to the twilio numbers.
    Required Params: campaignId

    Each Twilio phone number needs to be configured to point to:
    server.com/incoming_call?campaignId=12345
    from twilio.com/user/account/phone-numbers/incoming
    """
    params, campaign = parse_params(request)

    return intro_zip_gather(params, campaign)


@app.route("/zip_parse", methods=call_methods)
def zip_parse():
    """
    Handle a zip code entered by the user.
    Required Params: campaignId, Digits
    """
    params, campaign = parse_params(request)
    zipcode = request.values.get('Digits', '')
    rep_ids = data.locate_member_ids(zipcode, campaign)

    if app.debug:
        print 'DEBUG: zipcode = {}'.format(zipcode)

    if not rep_ids:
        resp = twilio.twiml.Response()
        play_or_say(resp, campaign['msg_invalid_zip'])

        return zip_gather(resp, params, campaign)

    params['zipcode'] = zipcode
    params['repIds'] = rep_ids

    return make_calls(params, campaign)


@app.route('/make_single_call', methods=call_methods)
def make_single_call():
    params, campaign = parse_params(request)
    i = int(request.values.get('call_index', 0))
    params['call_index'] = i
    member = [l for l in data.legislators
              if l['bioguide_id'] == params['repIds'][i]][0]
    congress_phone = member['phone']
    full_name = unicode("{} {}".format(
        member['firstname'], member['lastname']), 'utf8')

    resp = twilio.twiml.Response()

    if 'voted_with_list' in campaign and \
            params['repIds'][i] in campaign['voted_with_list']:
        play_or_say(
            resp, campaign['msg_repo_intro_voted_with'], name=full_name)
    else:
        play_or_say(resp, campaign['msg_rep_intro'], name=full_name)

    if app.debug:
        print u'DEBUG: Call #{}, {} ({}) from make_single_call()'.format(
            i, full_name, congress_phone)

    resp.dial(congress_phone, **dialing_config(params))

    return str(resp)


@app.route('/call_complete', methods=call_methods)
def call_complete():
    params, campaign = parse_params(request)

    log_call(params, campaign, request)

    resp = twilio.twiml.Response()

    i = int(request.values.get('call_index', 0))

    if i == len(params['repIds']) - 1:
        # thank you for calling message
        play_or_say(resp, campaign['msg_final_thanks'])
    else:
        # call the next representative
        params['call_index'] = i + 1  # increment the call counter

        play_or_say(resp, campaign['msg_between_thanks'])

        resp.redirect(url_for('make_single_call', **params))

    return str(resp)


@app.route('/call_complete_status', methods=call_methods)
def call_complete_status():
    # asynch callback from twilio on call complete
    params, _ = parse_params(request)

    return jsonify({
        'phoneNumber': request.values.get('To', ''),
        'callStatus': request.values.get('CallStatus', 'unknown'),
        'repIds': params['repIds'],
        'campaignId': params['campaignId']
    })


@app.route('/demo')
def demo():
    return render_template('demo.html')


@cache.cached(timeout=5)
@app.route('/count')
def count():
    return jsonify(count=call_count())


@cache.cached(timeout=60, key_prefix=make_cache_key)
@app.route('/stats')
def stats():
    password = request.values.get('password', None)
    campaign = request.values.get('campaign', 'default')

    if password == app.config['SECRET_KEY']:
        return jsonify(aggregate_stats(campaign))
    else:
        return jsonify(error="access denied")


if __name__ == '__main__':
    # load the debugger config
    app.config.from_object('config.Config')
    app.run(host='0.0.0.0')